Taken from the L200-L300 Thread
Quote Originally Posted by Mr. Widget
... Yes you to can build it. It is so simple all you need are two low DCR .3mH inductors, a pair of 1.5uF mylar caps, a pair of 20 ohm resistors and an 8 ohm L-pad. The total cost would be about $15 each.
Have fun!
Widget
First let me appoligize for such a newbie question. Does it make a diference if I use an air core or iron core inductor?

Likewise, is there a preference material for the cap; mylar, metalized polypropylene, film/foil, etc...